---
title: "NWError.posix(_:)"
framework: network
role: symbol
role_heading: Case
path: "network/nwerror/posix(_:)"
---

# NWError.posix(_:)

A POSIX error, which is used for most network protocol and routing errors.

## Declaration

```swift
case posix(POSIXErrorCode)
```

## See Also

### Checking Error Types

- [NWError.dns(_:)](network/nwerror/dns(_:).md)
- [NWError.tls(_:)](network/nwerror/tls(_:).md)